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If `pK_(b)` for fluoride ion at `25^(@)C` is 10.83, the ionisation constant of hydrofluoric acid at this temperature is
A. `1.74xx10^(-5)`
B. `3.52 xx 10^(-3)`
C. `6.75 xx 10^(-4)`
D. `5.38xx10^(-2)`.

1 Answer

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Correct Answer - C
The dissociation constants of a weak acid and its conjugate base are related as
` pK_(a)+pK_(b)=pK_(w)`
`:. pK_(a)+10.83=14 "or " pK_(a)=3.17`
`- log K_(a)=3.17`
or log `K_(a)=-3.17=bar(4).83 "or" K_(a)=6.76xx10^(-4)`.

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